Results 21 to 30 of about 6,358,449 (233)
Quantum Information Processing with Continuous Variables and Atomic Ensembles [PDF]
, 2011 Quantum information theory promises many advances in science and technology. This thesis presents three different results in quantum information theory. The first result addresses the theoretical foundations of quantum metrology.
Zwierz, Marcin
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Unbiased quantum phase estimation
Quantum Information and Computation, 2023 Quantum phase estimation algorithm (PEA) is one of the most important algorithms in early studies of quantum computation. However, we find that the PEA is not an unbiased estimation, which prevents the estimation error from achieving an arbitrarily small level. In this paper, we propose an unbiased phase estimation algorithm (UPEA) based on the
Xi Lu, Hongwei Lin
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Optimal Quantum Phase Estimation [PDF]
Physical Review Letters, 2009 By using a systematic optimization approach we determine quantum states of light with definite photon number leading to the best possible precision in optical two mode interferometry. Our treatment takes into account the experimentally relevant situation of photon losses.
Dorner, U +6 more
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Imperfect Distributed Quantum Phase Estimation [PDF]
, 2020 In the near-term, the number of qubits in quantum computers will be limited to a few hundreds. Therefore, problems are often too large and complex to be run on quantum devices. By distributing quantum algorithms over different devices, larger problem instances can be run.
Niels M. P. Neumann +2 more
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Topics in estimation of quantum channels [PDF]
, 2010 A quantum channel is a mapping which sends density matrices to density matrices. The estimation of quantum channels is of great importance to the field of quantum information.
O'Loan, Caleb J.
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Optimal Quantum Measurements for Phase Estimation [PDF]
Physical Review Letters, 1995 Quantum information theory is applied to practical interferometer-based phase measurements to deduce the optimal phase measurement scheme with two optical modes. Optimal phase measurements, given ideal input states, reveal an asymptotic 1/n decrease in phase uncertainty Delta theta for n the mean photon number of the input state.
Sanders, BC, Milburn, GJ
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On quantum phase crossovers in finite systems [PDF]
, 2006 In this work we define a formal notion of a quantum phase crossover for certain Bethe ansatz solvable models. The approach we adopt exploits an exact mapping of the spectrum of a many-body integrable system, which admits an exact Bethe ansatz solution ...
Hibberd, Katrina E. +2 more
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Adaptive phase estimation through a genetic algorithm
Physical Review Research, 2020 Quantum metrology is one of the most relevant applications of quantum information theory to quantum technologies. Here, quantum probes are exploited to overcome classical bounds in the estimation of unknown parameters.
Kartikeya Rambhatla +5 more
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Quantum theory of reactive scattering in phase space [PDF]
, 2010 We review recent results on quantum reactive scattering from a phase space perspective. The approach uses classical and quantum versions of normal form theory and the perspective of dynamical systems theory.
Brandas, E +17 more
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Randomized Quantum Algorithm for Statistical Phase Estimation
Physical Review Letters, 2022 Phase estimation is a quantum algorithm for measuring the eigenvalues of a Hamiltonian. We propose and rigorously analyse a randomized phase estimation algorithm with two distinctive features. First, our algorithm has complexity independent of the number of terms L in the Hamiltonian.
Kianna Wan +2 more
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